Why is 3rd shell 8 or 18

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Apr 15, 2014 · So, sodium's 11 electrons are arranged this way: 2 electrons in the first "shell", 8 electrons in the second "shell"; and 1 electron (the valence electron) in the third "shell". We write this as 2.8.1. The last number is how we know the number of valence electrons. Aluminium has the electron arrangement 2.8.3. It has 3 valence electrons.
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According to the octet rule, atoms like to have their valence shell filled with 8 electrons when the form bonds with other atoms, but if the third shell has a capacity for 18 electrons, then why ...
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The result of all of these interactions is a pair of atoms each with an outermost shell like that of one of the inert gases: 2 for hydrogen, 8 for the others. The elements with 2 electrons in their outermost shell interact with chlorine and the other halogens to form, e.g., BeCl 2 , MgCl 2 , CaCl 2 .
The notation 3d 8 (read “three–d–eight”) indicates eight electrons in the d subshell (i.e., l = 2) of the principal shell for which n = 3. Figure 2. The diagram of an electron configuration specifies the subshell (n and l value, with letter symbol) and superscript number of electrons. The Aufbau Principle
CCSS.Math.Content.K.NBT.A.1 Compose and decompose numbers from 11 to 19 into ten ones and some further ones, e.g., by using objects or drawings, and record each composition or decomposition by a drawing or equation (such as 18 = 10 + 8); understand that these numbers are composed of ten ones and one, two, three, four, five, six, seven, eight, or nine ones.
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The 3rd shell can hold 8 at first, then later on can contain up to 18 because the 4s orbital fills before 3d, so for cobalt the electrons would be in the 4th shell I'd assume 0 reply
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eight electrons occupy the second shell one electron occupies the third shell This electronic structure can be written as 2,8,1 (each comma, or dot, separates one shell from the next).
The third shell can hold a maximum of 18 electrons. However, when the third shell contains 8 electrons, the fourth shell begins to fill. That is, the fourth shell begins to fill before the third shell is full. For the first 20 elements, the most electrons the third shell will contain is 8.
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8. Explain the rule according to which electrons are filled in various energy levels. Solution: i) The maximum capacity of a shell to accommodate electrons is given by the general formula 2n 2, where n is the serial number of a shell. ii) The maximum number of electrons possible in the outermost shell is 8, and that in the penultimate shell is 18.
Electronic configuration of Ar (18) = 2, 8, 8. Thus, valence electrons = 8 = 0 (outermost shell is completely filled). Electronic configuration of given element = 2, 8, 7. Valence electrons = 7. As valence electrons of F (9) are equal to 7 therefore it will have similar chemical property to the given element Cl (7). Question 6:
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Why is it called the mass number? Because it's the total amount of mass in an atom, the weight of the protons and neutrons because electrons have no mass. 1st shell: 2e=1s2 2nd shell: 8e= 2s2, 2p2 3rd shell: 8 or 18= 3s2,3p6 2,8,8,18.Week 8 Week 9 Week 10 Week 11 Week 12 Week 13 Second Trimester Week 14 Week 15 Week 16 Week 17 Week 18 Week 19 Week 20 Week 21 Week 22 Week 23 Week 24 Week 25 Week 26 Third Trimester Week 27 Week 28 Week 29 Week 30 Week 31 Week 32 Week 33 Week 34 Week 35 Week 36 Week 37 Week 38 Week 39 Week 40 Week 41 Week 42 ↑ Increase operational efficiency, while transforming how products are created and serviced. Learn how PTC is changing the game in digital transformation. Six-Day War, brief Arab-Israeli war that took place June 5–10, 1967. After months of escalation, Israel conducted a preemptive air assault demobilizing its neighbors’ air force capabilities, allowing it a quick and decisive victory. The war had lasting impact on diplomatic engagement between Israel and its neighbors.

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Why is it called the mass number? Because it's the total amount of mass in an atom, the weight of the protons and neutrons because electrons have no mass. 1st shell: 2e=1s2 2nd shell: 8e= 2s2, 2p2 3rd shell: 8 or 18= 3s2,3p6 2,8,8,18.

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